Could there be something wrong with the default collision model? There's no arg. 1, for example
What has worked for me was defining a new plane, with a well known name/display name. But it still requires more work.
Mig_31M = {
Name = 'MiG-31',
DisplayName = _('MiG-31'),
But then, it's MP incompatible and can't land (see above).